On Fri, Feb 05, 2021 at 02:45:07PM +0000, Brian.Hutchinson--- via
Linuxptp-users wrote:
> ... which got me to thinking, could LinuxPPS be getting in the way of the
> 1PPS we're trying to generate with our fec_ptp imx8mm driver?
No, certainly not.
> Wondering if CONFIG_PPS should be turned off in kernel if we are doing 1PPS
> with imx8 fec_php driver or is it needed?
The CONFIG_PPS is selected by PTP, and so you cannot turn it off.
config PTP_1588_CLOCK
tristate "PTP clock support"
depends on NET && POSIX_TIMERS
select PPS
The reason for this is that some PTP Hardware Clock drivers generate
events for the PPS sub-system. However these are "software" time
stamps and are totally unrelated to actual "hardware" output signals.
I'm not familiar with the IMX's FEC hardware, but IIRC it actually
does not support proper periodic output signals at all. I could be
wrong, though.
Thanks,
Richard
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